Excavator and loader



J. R. KENNEDY EXCAVATOR AND LOADER July 22, 1952 3 Sheets-Sheet l FiledApril .17, 1947 J. R. KENNEDY J. R. KENNEDY EXCAVATOR AND LOADER July22, 1952 3 Sheets-Sheet 2 Filed April 17, 1947 w M M K JMW w mm 0N July22, 1952 I I J. R. KENNEDY EXCAVATOR AND LOADER 3 Sheets-Sheet 5 Filed Aril 17, 1947 J R. K/S/VA/EDY Patented July 22, 1952 UNITED STATES PATENTOFFICE 2,603,894.' EXCAVATOR AND LOADERI J amesR. Kennedy, Purcell,kla.Application April 17, 1947, Serial No. 741,971

This invention relates to machinesfor material handlingandmorepar-ticularly to'a tiltable scoop excavator and'loader. The machinemay be employedifor example, associated with a. tractor, as a;combination excavator and loader for earth working;

An. important objectof the invention isto provide a machine of this kindincluding means for automatically: setting the scoop in the properposition at all times during operation so as to utilize to. the full the-pressure fluid power employed; \vhich power may be derived fromv thatcontaineddn the tractor, for example, upon which themachine is mounted.Another important object isto simplify the constructionofi a tiltablescoop excavator andloader, associatedw-ith: a suitable vehicle,employing but onercontrollever, for controllingthe fluid pres.- suretotwo hydraulic cylinders, forming portions of the tilting means.

Still-another important object is to provide a novel means for initiallytilting. a loaded, scoop or-shovel, raising the same to aselectedheight, holding it at this height untilthe vehicle to which thescoop is operatively connected is moved, the scoopthen elevated to ahigher position or lowered to=ra lower. position, or permitted to remainin its initially-raised position, then tilted into a dumping positionand, when the vehicle is again, in position for loading of the scoop,the latter may be-lowered-to itsloading position.

Yet another. object is to provide a novel means for, manipulation ofatiltable scoop, whereby the latter may be'oscillated in order topenetrate andbreak up hardsurfaces andsub-surface material inwhichfitmay work.

Other objects and advantages of the invention will-be apparent duringthe course of. the following.detaileddescriptionof the invention, takenin connection. with. the accompanying drawings, forming apart of thisspecification, and. in which drawings:

, Figure 1 isa'side elevationof a vehicle upon which the novel. machineis mounted, with the scoopor shovel thereof in a-lowered position.

' Figure Zis a side elevation of the forward portion ofjthe vehicle,with the scoop or shovel of the'new'machine in'a raised position. Figure3is a side view of the forward portion of 'the vehicle; vshowing theside of the -new'machine opposite the sideshown in'Figures 1 and 2 andthe'scoop'or shovel lowered.

Figure'is a'fragmentaryside view of a cylinder and piston and'as'sociatedparts forming a portion shovel;

Claims. (Cl. 37 -1175) 2, v Figure 5 is an end elevation. of. pulleys,and" a' drum, with a ratchet, wheel forming a partiofjthe means toeffect operation of the scoop or; shovel. Figure 6 isv a sectional. viewofaratchet wheiel forming partv oftheassembly of Figure 5,; and taken onthe 1ine55 of Fig. 6. t

Figure 7 is an end elevation of a rocker arm associated with a. movablesupport for thescoop or shovel. V f J v Figure 8 i's'a fragmentary planview of the mov -1 able supportfor the scoop. or shovelsubstanti'al? 1yvonthe line 8--8 of Figure 2'. H Y

Figure 9 is a vertical section of .a slidableand rotatable assemblyforming part of the meansto" efiect operation of the scoop or shovel,substantially on the,line.9,9 o f"Fi ure 3; f Figure 10"is anelevation,of' a- 'pulleysuppo'rt bracket forming a part of the means to effectoperation of the scoop orshovel p f In the drawings wherein; for thepurpose of illustrationisshown, a preferred embodiment of the inventionand wherein similar reference characters designate corresponding'partsthroughout the several views, the letter 'A-designates the noveltiltable-scoop excavator and loader; and the lett'er B avehicle uponwhichit is mounted.- and. which carries apower taRe-OffCL' j The noveltiltable-scoop-excavator and l'oader A includes a pair of sideframe-members, suitably spaced apart insubstantial parallelism,'eachhaving'a frontend l6 which-carries apulleysupport bracket l1 having ahorizontal supportfa'ce. Referring to Figures 1 and 2, which show oneside frame member t5, and Figure 3,which illustratesthe other member [5,each member 15 rock.- ably. supports a rocker arm I 8, best shown inFigure 7, which preferably consists of two parallel spaced-apart armportions, one being an outer portion I9 and the other an innerportion2!]; To one of these portions (20, inthe example shown) isfixedly'secured a drum or'pulley' 22 having one flange 23 but theadjoining-arm porrtion Zllfunctions as the secondflange; The two rockerarms |8 with their associated drums22 are fixedly connected by a shaft24 journaled in the two side members I 5';

Theupper end of; each. rocker arm |8,:is ;pi v ota'lly. connectedwiththerean-of: an upper scoop,- control arm assembly-"25, which. comprises;a rear control arm portion 26 (to the J-shaped rear end. of whichtheupper end of the. rocken arm l8 isv pivotally connected), a frontcontrol arm portion 2?I and an intermediate portion 28 whichis'preferably a tube with the'front, end section of the rear control armportiomslidable therein. and. the rear. end section: of:v the;frontfex'plained.

control arm portion extending into the front end of the intermediateportion 28 and fixedly secured thereto, as by welding.

Means is provided, as shown in Figure 8, to prevent the front endsection of the rear control arm portion 26 of the arm assembly 25, shownin Figs. 1 and 2, from sliding wholly from the tubular intermediateportion 28 and may comprise a suitable headed stud or projection 35,with the body of the stud or projection extending through alongitudinally-extending slot 3| in the rear section of the intermediateportion 28.

The lower end of each rocker arm I8 is pivotally connected with the rearend of a lower control arm assembly 32, each assembly preferablycomprising a single substantially straight.

arm portion 33 provided with an upstanding,

longitudinally -extending flange portion 34,,

mounting an eyed member 35 for attachment of a flexible member tobedescribed.

' A suitable scoop or shovel 3B is supported wholly by the two controlarm assemblies 25 and 32, with the upper rear portion of the scoop orshovel 36 pivotally connected with the two upper control arm assembliesand the lower rear portion of, the same pivotally connected with. thetwo'lower control arm assemblies 32. ,Thisscoop or'shovel may includeside wall portions 31 sup- 4 arm assemblies 25 (in the example shown,the assembly 25 of Figure 3) is the structure shown in detail in Figure4. This structure includes a pair of upwardly extending bracket andspring abutments 53 and 54. The abutment 53 is fixedly secured, as bywelding, to the rear end of the intermediate portion 28 and the abutment54 is fixedly secured to the intermediate section of the rear controlarm portion 26, as by welding. so that the two abutments are spacedapart and an expansion coil spring 55 bears against the abutments andencircles that part of the rear control arm portion 26 between theabutment 53 and abutment 54.

Supported by the abutment 54 is a cylinder 56 from the rear end of whichslidably extends a piston rod 51 carrying a suitable piston head withinthe cylinder 56. A tube 58 for pressure fluid opens into the cylinderschamber adjacent porting a combined arcuate rear and bottom wall portionterminating at its forward end 'in a somewhat sharp edge 38 extendingforwardly of the vertical planes of the front edges of the sidewallportions 31.

Means 40 .to effect operative the scoop or shovel 36 includes structuresshown ln-Figures l and .2 .and detailed inFigures 5 and 6, as'follows:In Figure 5 there is detailed a block 4| carrying two idler pulleys 42with the block mounted upon a shaft 43 and connected, as by thecylindrical member or drum .44 with a ratchet wheel fixed to the drum44Since the'drum 44 supports a flexible connection to be described, oneouter face of the block--:4l and one face of the ratchet wheel 45provides flanges for this drum 44. Associated with the ratchet wheel 45is a pawl 46, movable by operation of a control rod 41 with the freeend-of'thelatter within reach of an occupant of the vehicle BwWhen thescoop or shovel 35 is raised, as in Figure "2, the pawl 46 engagesa-tooth near the right-hand end of the row of teethof the ratchet wheel45 but when the scoop orshovel36 is lowered, as in Figure '1, the pawlengages a tooth adjacent the left hand end of the rowof teeth. The shaft43 is journaled in one of the side frame members I5.

Additional portions of means 40 includes the pulley support bracket 48,shown more specifically in Figure 10, and a-pair of pulleys 49 andportion '52 bridging the uprights 5| and se-.

cured thereto. Extending through the tubular -portion 5l is a shaft uponthe ends of which are secured the pulleys 49 and 50. The pulley 49 alsofunctions as a drum as will be subsequently -Be'fo're describing theseveral flexible connections' included in the means 40, just described,those portions of the structure of the means 40, shownparticularly inFigures 3, 4 and 9 'will beexplained. 1 v

Mounted upon one of the upper scoop-control movements of the end (headend) opposite that from which the piston extends. The rear end of thepiston rod 51 is fixed to the bight 55fof a substantially U-shaped yoke55' with the arms thereof'secured to the abutment 53. One of thefunctions of the spring 55 is to tend to force the piston head towardthe head end of the cylinder 56, but this has another function as willbe detailed later.

Referring now to thestructure in Figure 3 above that just described, abracket extends upwardly from, preferably, the rear end of the sideframe member I5 which supports theabutments 53 and 54. The bracket 60supports the rear ends of two horizontally disposed, substantiallyparallel guide rods 6| whose front ends-are secured to the pulleysupport bracket 48. j Carried by the guide rods BI is a fixed structurecomprising a major cylinder 62 disposed adjacent the front end portionsof the guide rods BI, and a sliding or reciprocating structurecomprising a piston rod 53 for the cylinder62 extending'outwardly of therear end thereof, having an arcuately-faced shoe 64 at its outer endbearing against the peripheralportion of a sheave'housing 65. isdisposed about a sheave 56 and pivotally supports the latter. Thehousing 55 is, in turn, flxedly supported by two sleeves 61 which extendabout portions of the guide rods 6!, and are adapted to slide back andforth along these rod'sj. The housing 65 is disposed, inclined from thevertical, as in Figure 9 and may be welded to the sleeves 61. A tube 63for pressure fluid opens into the head end of the cylinder 62 andextends to a coupling 69 for it, the tube 58 and a main conduit 10 forpressure fluid extending to any suitable source (not shown) of suchfluid.

The flexible connections forming parts of the means 40 are as follows:Referring first to Figures 1 and 2, there is a flexible connection 15such as wire cable, secured at one end to the drum 44 of Figure 5, towind thereabout and, from thisdrum, the connection 15 extends forwardlyto and is secured to one end of a retraction spring 18,, the other endof which spring is secured to one of the brackets ll of the adjacentside frame member [5. A flexible connection 11 extends, from one eyedmember 35 of the lower scoop-control arm assembly 32, shown in Figures 1and 2, up-

wardly to the pulley 49, extends fully around it v pulley 42, thendiagonally upwardly to the upper idler pulley 42, over and partly aroundwhichit As shown in Figure 9, this housing'65 lateness travels,thenceadownwardly'andrrearwardly-tothe adjacent: drum. 22-:to which itissecured: Referring to the flexible connections showncmoreparticularlyin: Figure. 3, there is. a flexible: cone 'Irection" 18;. aswire cable, secured to; the other eyed 'member 35' and extends upwardly:to, and around the pulley 50, thenceextends rearwardly to and'partly.around'the sheave 6.6 andzt-hen ex.- tends: forwardly to the supportbracket' 48-to which it is secured. A fourth'fiexibleconnectionl9i'asw-ire-cable, extendsfrom therear endofa contractioncoil. spring;80, which latterissecured at; its. other end to: the scoop or shovel 316at preferably the rear portion: thereof: intermediate theupper. andlower: endsof the scoop :or-sh'ovel. This flexible connection. 19'extends frOm: the spring; 80;..rearwardly to. the adjacent; pulley- 22tolwhichitris secured;

- :The: vehicle, B'ais. illustrated as a conventional tractor? uponwhich. the novel machine-A is mounted? in any approved way; preferably"adjacentfthei forward :end thereof with-.the side :frame member IE'secured to: the tractor-chassis so; that the shaft): connecting thedrums ,22 and rocker arms 18 may passtransversely. under the tractor B.andsthe horizontal' tubular portion 52" of the pulley" support bracket48 extend: transv ersely acrossthe frontend-of the vehicle. i

In operation, thervehicleB is, of course; moved forwardly; with thescoop on shovel 36 in. the positions: shown in Figures 1? and" 3'sotthat the ilatter will contact the material beingv worked upon. andcause it. "to move intothe scoop -or shovel-'36; Upon operation of-theconventional valve control leverinotshowniof .the pressure fluid?system, pressure fluid will. be "permitted to fi'owf'along' conduitcoupling 69 anditubestfi'll andifit; Since there isobviouslyless lo'ado'n that portion' of the pressure system representediby' the cylinder5'6 and associatedstructure thanio'n'th'at portion represented by thecylinder 62 and its associated" structure, that portionincludingthe-cyl- 'inder 56i operates first so that piston rod? 51" is forcedoutwardly to its limit ofmovement,.whereupon the-pressure forcespistonro'd 63 outwardly and the" rear control arm portion 26srearwardly,

which "causes rocking in one. direction of the rocker arm 1 8and'forward movement of-thelower control arm assemblyw 32: The movementof piston rod 51 compresses spring 55 and'the'movements of the armportion 26 and" arm assembly 3 2 draw the upper 'end, portion of J thescoop-3B backwardly; thustilting the latter and'causingfit to: cutintothe material at an angle from 'the horizontal and cases the load onthevehicieB. Thistilting is such that the load carriedby the scoop :Willnot be lost. When sufficiently tilted the? scoop i' 1 ressure-held inits tilted position. Obviously; alternately opening and closing" thepressure valve will cause rocking movements" of thezpartlyloaded scoopand thus'aid it in workin'g into diflicultmaterial.

= "The: subsequent movement of the piston rod 63 causesfthe'. shoe 64to' force the sheavehousin'g 'tii toward thefirear end" consequentdrawing-up of control arm' assembly 25 forwardlyi and the lower ,scoopcontrol arm, assembly 32, irear.wardly; thus tilting the scoop; i162 asinFigure: 2.; and dumping theloa-d: At..:this timeiithe SDI'ing8"h8/S.:'eX-r panded but: when the fiuid; pressure is; released,thisrspring may; contract'gand its; contraction permits; because of theconnection therewithlof j the flexible connection 119;; the pulleys 22:to rotate in a. direction opposite,- to the direction heretoforedescribediand; since thefiuid pressure is nowreleased; the flexibleconnections 11 and 18 will slacken; Theiconsequent rotation of thepulleys 22 causes rocking. of, the rocker arms out of the positions:as-shown by one in Figure. 2, so. that the scoop is ri'ghtenedi Releaseofthe fiuidpressure permits: the scoop tolower by reason of. its weightandthe: scoop is now in position to} per.- form; another-loading ormoving; operation.

The height towh'ich thescoop may rise ispcone trollediby' means of,thecontrol rod 41, pawl 46 operated xthereby, ratchet wheel 45'associated with the: pawl, and: the operative connection,- of theratchetwheel with the rest oftheassembly, particularly the'blo'ck-M anditsidler pulleys. When elevated to a 'desired position- (not necessarilyits'highestposition), the vehicle Bmaybe 'moved' to; a '-positi0n=where. thescoop load may -betdischarged: Manipulationof theconventionalpressure fluid rvalve lever" permits; asis now' obvious; further raisingof the scoop to? its maximum: highest position. before dumping,:or-lowering it below itsgcarryingr position; for: dumping; Y When: thefluid pressure-in thec'ylirider SB-is released throughhthe tubecBB; thespring 55, working against the abutment 53, whichis fixedly seemed. asby welding, to; the rear end of the intermediate portion 2-8; forces theshovel 36 into-1 the normalaor loading position shown in Figure 3.. I I

Various changes may. be made to the form of the invention herein shownand' described without departing-from the-spirit off-the invention or"scope ofthe-claims-.. I

What is claimed is: -"1-'. In: a material 'handlerya scoop? meansforselectively maintaining the scoop in a-scooping position, in arearwardly-tilted position and in a forwardly-tilted' position,including. an: upper scoop controlarm assembly, including a" rearcontrol arm: portion, afront control i armgportion and an-intermediatetubular portion, with the front end-section ofsaid rear controlarmportion 'slida'bly retained in said intermediate tubular portion andsaid front 'control arm portion fixedlysecured'to'said intermediatetubularportion, an expansion coil spring about an intermediate sectionof: said rear control arm portion rear- Wardly of said frontiendsectionthereof, anabutment carried by said rear control arm portion 'rearwardlyofzs'aid"intermediat'esection, an abutrment'icarried'by thez-rear end-ofsaid intermediate tubular portion,i:with said coilyspring bearingagainst" said abutments, a lower scoop-control a'rni assembly, bothassemblies pivotally con,- nested-with said'scoo-p, a rocker arm;and-means pivotally connecting-the assemblies: with said .rocker'arm forreciprocation in} opposite directionszupon: oscillation'zof said rockerarm; means operatively"connected with said rocker armfor rocking saidrocker arm in one direction; including a pressure fluid cylinder; and apiston. rod therefor; with said. cylinder supportedby: one ofsaidr'abutments and the pistonrodoperatively connected with the otherabutment;v and means .to'roclt said'rocker arm in-the oppositedirection. 2. In a material handlerla scoop; meansdor .7 semetiveiymaintaining the scoop in a scooping position, in a rearwardly-tiltedposition and in a'forwardly tilted position, including an upperscoop-control armassembly, including a' rear control arm portion, afront control arm portion and an'intermediate tubular portion, with thefront end section of said rear control arm portion slidably retained insaid intermediate tubular portion and said front control arm portionfixedly secured to said intermediate tubular portion, an expansion coilspring about an intermediate section of said rear control arm portionrearwardly of said front end section thereof, an abutment carried bysaid 'rearcontrol arm portion rearwardly of said intermediate section,an abutment carried by the rear end of said'intermediate tubularportion, with said coil spring bearing against said abutments, a lowerscoop-control arm assembly; both assemblies pivotally connectedwith saidscoop, a rocker arm, and means pivotally connecting the assemblies with{said rocker-arm for reciprocation in opposite directions uponoscillation of said rocker arm; means for rocking said rocker arm in'onedirection, including a pressure fluid cylinder and a piston rodtherefor, with said, cylinder supported by one of said abutments and thepiston rod operatively connected with the other abutment; means to rocksaid rocker arm in the opposite direction; a drum operatively secured tosaid rocker arm for rotation upon 'oscillationof said rocker arm and aflexible connection mounted upon said drum and operatively-connected tosaid scoop; and means operatively connected with said assemblies toraise and lower said scoop.

' 3. In a'material handler, ascoop; meansfor selectively maintaining thescoop in a scooping position, in a rearwardly-tilted position and in aforwardly-tilted position, including an upper scoop-control arm'assembly, including a rear control arm portion, a front control armportion and an intermediate tubular portion, with the front end sectionof said rear control arm portion slidably retained in said intermediatetubular portion'and said front'controlarm portion fixedly secured tosaid intermediate tubular portion, an expansion coil spring about anintermediate section of said rear control arm portion rearwardlyofsaidfront end section thereof, an abutment carried by said rear controlarm portion rearwardly ofsai'd intermediate section, an abutment carriedby the rear end of said intermediate tubular portion, with said coilspring bearing against said abutments, a lower scoop-control armassembly, both assemblies pivotally connected'with said scoop, a rockerarm, and means pivotally connecting the assemblies with said rocker armfor reciprocation in opposite 'directions upon oscillation of saidrocker arm; means for rocking said rocker. arm in one direction,including a pressure fluid cylinder and a piston rod'therefor, with saidcylinder supported by-one ofsaid abutments and the piston rodoperatively connected with the other abutment; means to rock said rockerarm in the opposite direction; a drum operatively secured to said rockerarm for rotation upon oscillation of said rocker arm, a flexibleconnection mounted upon said drum and a retraction coil spring securedat one end to said scoop and secured at its other end to said flexibleconnection; and means operatively connected with both of said assembliesto raise and lower said scoop.

4. In a material handler, a scoop; means for selectively maintaining thescoop ina scooping '8 position, in a rearwardly-tilted position and in aforwardly-tilted position, including an upper scoop-control armassembly, including a rear control arm portion, a front'fcontrolarm-portion and an intermediate tubular portion,'with the front endsection of said rear control arm portion slidably retained in saidintermediate tubular portion and said front control arm portion fixedlysecured to said intermediate tubular portion, an expansion coil springabout an intermediate section of said rear control arm portionrearwardly ofsaid front end section thereof, an abutment carried by saidrear control arm portion rearwardly ofsaid intermediate section, anabutment carried by the 'rear end of said intermediate tubular'portion,with said coil spring bearing against said abutments, a lowerscoop-control arm assembly, both assemblies pivotally connected withsaid scoop, a rocker'armgand means pivotally connecting the assemblieswith said rocker arm for reciprocation in opposite directions uponoscillation of'said'rockeriarms; meanszfor rocking said rocker' arm inone direction, including a pressure fluid cylinder and'a piston rodtherefor with said cylindersupported by one of said abutments and thepiston rod operatively connected with the other abutments; means to rocksaid rocker arm in the oppositedirection; a drum operatively secured tosaid rocker arm forv rotation upon oscillation of said rocker arm','aflexible connection mounted upon said drum and aretra'ctionxcoil ispringsecured at one end to said 5. In a material handler, a scoop, a support,

means for selectively maintaining the scoop in a scooping position, in arearwardly-tilted position and in a'forwardly-tilted position, includingan upper scoop-control arm assembly, including a rear control armportion, a front control arm portion and an intermediate tubular,portion, with the front section of said rear control arm portionslidably retained in saidintermediate tubular portioniand saidfrontcontrol arm portion fixedly secured to said intermediate tubularportion, an expansion coil spring about an intermediate section of saidrear control arm portion rearwardly of said front end section thereof,an abutment carried by said rear control arm portion rearwardly of saidintermediate section, an abutment carried by the rear end of saidintermediate tubular portion, with said coil spring bearing against saidabutments,: alower scoop-control arm assembly, both assembliespivotally' connected with said scoop, a rocker arm, and means pivotallyconnecting the assemblies with said rocker arm for reciprocation inopposite directions upon oscillation of said rocker arm; means forrocking said rocker arm in one direction, including a pressure fluidcylinder and a piston rod therefor, with said cylinder supported by oneof said abutments and the piston rod operatively connected with theother abutment, a drum operatively secured to said rocker arm forrotation upon oscillation of said rocker arm, a flexible connectionmounted, upon' said drum and .a, re

tractionjcoil spring secured at one end to Said scoop andzse'curediatits other endtosaid flexible connection, means operativelyqconnectedwith,

both of -;.said;assemblies to raise; and lower said scop,:including '.ashaft; with said drum fixedly mounted thereon, a second drum fixedlymounted on:said shaft,.'a 'iblock, a pair ofidler pulleysrotatably,mountedqthereon, a second shaft with Saidib1OGk,mD1-1ntd uponsaid secondshaft for. oscillation,.,ia; third drum mounted" upon saidsecondishaftd a/secondfiexible connection with oneendsportion;thereofLwound upon and securediito;

said second drum and its other end secured to said.lowercscoopwontrol'arm assembly, said second ifiexible connectionextending over, and betweensaidgidler pulleys, and a thirdflexibleconandlin.aforWardlyetflted position including anuppengscoopwo'ntrol arm assembly, including a rear control arm .portion,afront control arm portion andan intermediate tubular. portion, withtherfront,endjsection of saidrear control arm portion slidably retainedin said intermediate tubulanportionand said front control arm portionfixedly secured to said intermediate tubular por,ti on-,; anexpansioncco'il spring about an intermediatesection, ofnsaid rearcontrol arm portionrearwardly, of saidlfront end section thereof, anahutmentcarried .hy .said, rear control arm portionrearwardly. of saidintermediate section, an abutmentmcarried by,the rear end of saidinter.- mediate, tubular portion, with said coil springbearingiagainstsai'd, abutments, a lower scoop.'

control. arm jassembly, both assemblies pivotally connected ,withsaidscoop. a rocker arm, and

me'ans;.pivotally connecting the assemblies .with

said ;rockerarm .ior, reciprocation in oppositedirections;upo.n,'oscil1ation of 'said'rocker' arm; means for; rockingsaid rocker arm in one direc-- tion, includingaa pressure fluid cylinderand a piston-rodzathereof, with. said cylinder supported by ,OIIBLOf'.saidabutment's and the piston rod operatively, connectedwith the otherabutment, a drum,operatiuelysseoured to said rocker arm fonrotation'uponoscillation of said rocker arm, aeflexible connectiongnounted upon saiddrum andi-aeretraction.,coil spring secured at one end to'isaidscoopand'secured at its other end to said flexible. .connection;.;meansoperatively connected withifboth, of. said assemblies to raise and lowersaid,sco op,w,including va shaft, with said ,drum fixedly mounted,thereon, a second drum lfixedly mounted onsaid, shaft, a block, a pairof idler pulleys rotatably, mounted thereon, a second shaft ,with saidblock; mounted upon said second shaft for oscillation, athirdidrummounted upon saidasecond shaft, a second fiexible connectionWithonejendportion thereof wound upon and secum to-said second drum andits other end securedto said lower scoop-control arm assem: bly'. ,saidsecond flexible connection extending over .,and .,bet W ien saididler'ipulleys, a second oontraotion coil spring with, one end thereof.seeu dgto -s aid ,sl liort, forwardly 'of. said. block, and a, thirdflexible connection with one .end thereof woundaboutlsaid third, drumand secured theretcian its voth r.e d.lses l esi to thaat ier; end ofsaid seco d c nt ac o ,c0i1. p e;: ans1. mea s :iZQ a tern te y take n apay, out the i term diatet ort o i ot aid secondrflexibl cone, cence. ,11 y 1:

7 n a. mat r a handl a scoopna support, means :for selectivel ma n aininth sco p--. n.1a-. scoop n rp sit 'onr in 3 6. '-W@IdlY1' i1t6dIP0511303 nd i a.: crw r e lt d positi n nc iidinezan pp r sc op-c nt oarmv a e b y nclud n ta,v ea cont l rm portion; a front ,go trolisarm.=

po t n n a ntermediatetu y ar o ti with h pfro tjend s ct n o .said rearontr l portion ,s idah wreta ned in ai interm diat ubu ar p rt n and vai ir lit c ntrol .arm.1n ;i ion fixed secur d 51 sai inierediateatubulap porti n an expa sion coil sp i about anintere m d atesect on o s id rea ont l miport on rearwardly of said front end s t n:-ther.eof, ian-;

butment \zc rried y said rea c ntrol arm IPQ r. io re -ward y' of {saidi te med a e :s,ecti0n,

bearing against said butments, a lower Scoops contr arm assemblil bothassemblies @ivotallr nnecte w aid. scoop; a rocker. arm, and

m an pisro ally; onn ct n th ass mb s w th ai v maker, a m; fo cip oation in opposite rect o v1 12 1 o c l at on .oflasaid tqokerf arm; meani ack n sa drocker arm .-i

oe r iv l conn cted witht e other atutmems.-v

drum co eraiiveln se ured t said JZQQKQI -;arm-;

sa i d, exible conn t on; means operatively con-.1

nectedw bh. 19th of said ,ass emblies to; raise and.- owe said coop in ui a shaitia seconddrnm Withea s con um fix dly mounted th reon a ;P1:flXed y mo nted, on said? shaft, ,a;b1'0,ck a a n. c. e znulleys rtatably'.m untedith r o i; secon s a t w th said b oc mou ted upon said.second shaft for oscillation; athirddrum-mou-nted: u o sai se ondshait,.a. seccnd.flexible;conneciia i rithon -e dportionthereof,woundunomand;ecured;ta said "secondrdrum; intermediate length :ofv said vsecondflexible connection, and {its oi er'gend secured; to. said. lower SQQ.p-r I arm; assemb m; aid se nd ii exihleiieqnne tion havi g. its d rectiof travel reversed-sat; said seeond drum and extending therefrom.overiiand. betwe n s id idl r pulleys, a fourthjdrummoun d; upon saidsupportgwith an intermediatie portion, ty-sai sec nd fl xible connectionW0u d:.- 2hr upon, and. a thirdjexible connection with :one and. owq neup csaidethird drum and secured e to an its igther ,endoperativelyzconnected with said support. Y p q 8. In' amaterialyhandler, a, scoop, a support, means for selectively maintainingthe-scoopiinea scooping position, in a rearwardly-c-tilted position andin a forwardlyetilted position including; an upper scooprcontrol armassembly; including arear controlv arm portion; atfront'controlwarmportion and an intermediate tubular portion; with. the front end sectionof-gsaid rear control arm portion s1idably retained in said:intermediate tubular portion-andsaid front control-arm por-; tionfixedly secured to; said intermediatev tubular portion, an expansioncoil spring about an inter. mediate section of said rear controlarmportion butmen carr ed by: the rear end-of idc-mtem mediat t l lflar'por o wit said coil sprin onedirecrionkin nd a a press re fluidcylinderzanda iston rq sthe efo wi h said cyl nder supported.- y :one osa d abu mentsand the pis on mdi abutment carried by said rear controlarm portion rearwardly of saidintermediate section, an abutment carriedby the rear end of said intermediate tubular portion, with said coilspring bearing against said abutments, a lower scoopcontrol armassembly, both assemblies pivotally connected with said scoop, a rockerarm, and meansipivotally connecting the assemblies with said rocker armfor reciprocation in opposite directions upon oscillation of said rockerarm; means for rocking said rocker arm in one direction, including apressure fluid cylinder and a piston rod therefor, with said cylindersupported by one of said abutments and the piston rod operativelyconnected wtih the other abutment, a drum operatively secured to saidrocker arm for rotation upon oscillation of said rocker arm, a-flexibleconnection mounted upon said drum and a retraction coil spring securedat one end to said scoop and secured at its other end to said flexibleconnection; means operativelyconnected with both of said assemblies toraise and lower said scoop, including a shaft, with said drum fixedlymounted thereon, a second drum fixedly mounted on said shaft, a block, apair of idler pulleys rotatably mounted thereon, a shaft with said blockmounted upon said second named shaft for oscillation, a third drummounted upon said second-named shaft, a second flexible connection withone end portion thereof wound upon and secured to said second drum,intermediate the length of said second flexible connection, and itsother end secured to said lower scoop-control arm assembly, said secondflexible "connection having its direction of travel reversed at saidsecond drum and extending therefrom over and between said idler pulleys,a fourth drum mounted upon said support,with an intermediate portion ofsaid second flexible connection wound thereupon, a second contractioncoil spring with one end thereof secured to said support forwardly ofsaid block, and a third flexible connection with one end thereof woundabout said third drum and secured thereto and its other, end secured tothe other end of said second contraction coil spring. 1

s 9. In a material handler, a scoop, a support, means for selectivelymaintaining the scoop in a scooping position, in a rearwardly-tiltedposition and in a forwardly-{tilted position including an upperscoop-control arm assembly, including a rear control arm portion, afront control arm portion and an intermediate tubular portion, with thefront end section of said rear control arm portion slidably retained insaid intermediate tubular portion and said front control arm portionfixedly secured to said intermediate tubular portion, an expansion coilspring about an intermediate section of said rear control arm portionrearwardly of said front end section thereof, an abutment carried bysaid rear control armportion rearwardly of said intermediate section, anabutment carried 'by the rear end of said intermediate tubular portion,with said coil spring bearing against said abutments, a lowerscoopcontr'ol'arm assembly, both assemblies pivotally connected withsaid scoop, a rocker arm, and means pivotally connecting the assemblieswith said rocker arm for reciprocation in'opposite directions uponoscillation of said rocker arm; means for rocking said rocker arm in onedirection, including a pressure fluidcylinder and a piston rod therefor,with said cylinder supported byone of said abutments and the piston rodoperatively connected with theother abutment,

a drum operatively secured to said rocker arm 1 for rotation uponoscillation of said rocker arm, a flexible connection mounted upon saiddrum and a retraction coil spring secured at one end to said scoop andsecured at its other end to said flexible connection; means operativelyconshaft for oscillation, a third drum mounted upon said second-namedshaft, a second flexible connection with'one end portion thereof woundupon and secured to said second drum, intermediate the length of saidsecond flexible connection,

and its other end secured to said lower scoop-:

control arm assembly, said second flexible connection having itsdirection of travel reversed at said second drum and extending therefromover and between said idler pulleys, a fourth drum mounted upon saidsupport, with an intermediate portion of said second flexible connectionwound thereupon, said block and third drum being disposed intermediatesaid second and fourth drums, a-second contraction coil'spring with oneend thereof secured to said support forwardly of said block, and a thirdflexible connection with one end thereof wound about said third drum andsecured thereto and its other end secured to the other end of saidsecond contraction coil spring. I

3 10. In a material handler, a scoop, a support, means for selectivelymaintaining the scoop in a scooping position, in' a rearwardly-tiltedposition and in a forwardly-tilted position including anupperscoop-control arm assembly, includinga' rear control arm portion, afront control arm portion and an intermediate tubular portion, with thefront end section of said rear controlarm portion slidably retained insaid intermediate tubular portion and said front control arm por tionfixedly secured to said intermediate tubular portion, an expansion coilspring about an inter-' mediate section of said rear control arm portionrearwardly of said front end section thereof, an abutment carried bysaid rear control arm portion rearwardly of said intermediate section,an abutment carried'by the rear end of said intermediate tubularportion, with said coil spring bearing against saidabutments, a lowerscoopcontrol arm assembly, both assemblies pivotally connected with saidscoop, a rocker arm, and means pivotally connecting the assemblies withsaid rocker arm for reciprocation in opposite directions uponoscillation of said rocker arm; means for rocking said rocker arm in onedirection, including a pressure fluid cylinder and a piston rod.therefor, with said cylinder supported by one of said abutments and thepiston rod operatively connected with the other abutment, a drumoperatively secured. to said rocker arm for rotation upon oscillation ofsaid rocker arm, a flexible connection mounted upon said drum and aretraction coil spring secured at one end to said scoop and secured atits other end to said flexible connection; means operatively connectedwith both of said assemblies to raise and lower said scoop, including ashaft, with said drum fixedly mounted thereon, a second drum fixedlymounted on said shaft, a block, a pair ofidler 13 for oscillation, athird drum mounted upon said second-named shaft, a second flexibleconnection with one end portion thereof wound upon and secured to saidsecond drum, intermediate the length of said second flexible connection,and its other end secured to said lower scoop-control arm assembly, saidsecond flexible connection having its direction of travel reversed atsaid second drum and extending therefrom over and between said idlerpulleys, a fourth drum mounted upon said support, with an intermediateportion of said second flexible connection wound thereupon, saidblock-and third drum being disposed intermediate said second and fourthdrums, and saidsecond flexible connection being secured to said fourthdrum, whereby,- as said fourth drum rotates in one direction, additionalturns of said second flexible connection will form thereupon and as saidfourth drum rotates in the 14- other direction, turns of said secondflexible connection will unwind from said fourth drum, a

second contraction coil spring with one end.

thereof secured to said support forwardly of said block, and a thirdflexible connection with one end thereof wound about said third drum andsecured thereto and its other end secured to the other end of saidsecond contraction coil spring.

JAMES R. KENNEDY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Drott et al. Dec. '7, 1948

